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I am a workers’ compensation and serious injury attorney with over 35 years of experience advocating for injured individuals in Missouri and Illinois. Before becoming an attorney, I was a Registered Nurse — and that medical foundation continues to shape how I practice law today.
My career began representing insurance companies and employers. That experience gave me an inside understanding of how claims are evaluated, defended, and often minimized. Today, I use that knowledge to advocate exclusively for injured workers and accident victims.
As a nurse-turned-lawyer, I approach every case with both clinical insight and legal precision. I understand medical records, impairment ratings, causation issues, and the long-term impact injuries have on a person’s ability to work and live fully. This dual background allows me to identify strengths in a case that others may overlook.
My practice focuses primarily on:
• Missouri and Illinois Workers’ Compensation
• Permanent Total Disability claims
• Complex and medically intensive cases
• Serious personal injury matters
I lead a focused, all-female firm committed to compassionate, highly strategic representation. My clients are never treated as files or numbers. Injury cases are deeply personal — they affect income, identity, family stability, and peace of mind. I take that responsibility seriously.
I believe strong advocacy requires both strength and empathy. As a nurse, I cared for patients. As an attorney, I fight for them.
3
Practice Areas
35 years | 25,000 cases
35 years | 5,000 cases
35 years | 200 cases
Free Consultation
$0 first 15 minutes
25%-35%
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Chat withState: Colorado
Acquired: 2003
No misconduct found
State: Illinois
Acquired: 1992
No misconduct found
State: Missouri
Acquired: 1991
No misconduct found
425 North New Ballas Road, Saint Louis, MO, 63141
24 Client Reviews
Showing 6 - 10 of 12 reviews | Practice Area Knowledge
Posted by Christine | February 06, 2012 | Workers Compensation
Very Smooth Experience
I had a great experience with Cynthia Hennessey and her office. I fell at work and broke my ankle in three places requiring surgery with plates and screws. My recovery was long and drawn out. Cynthia was always great with keeping me posted as to what was happening with my case. I liked that she han...
Posted by Julie | February 02, 2012 | Workers Compensation
Great Experience
I never in a million years thought I would need a lawyer for a Workers Comp injury. I am a pharmaceutical sales rep and I fell down 5 stairs while carrying a load of work materials, I hurt my neck and couldn’t work. Workers Comp tried to deny this at first. It was then that I knew I needed a lawye...
Posted by donna | January 29, 2012 | Workers Compensation
Very Nice, Trustworthy
When my 70 year old father fell at work (believe it or not he was still working 30 hours a week in a machine shop) severely injuring his leg I couldn’t believe that the Workers’ Comp. insurance company would give him a hard time. I researched every attorney in the area, and knew I wanted to hire ...
Posted by fred | January 29, 2012 | Workers Compensation
Very Good Experience
I went to Cynthia’s Workers’ Comp. 101 workshop in Collinsville because the lawyer I had wasn’t doing anything on my case. I learned more that evening than I ever thought possible. I fired my lawyer the next day and hired Cynthia. Cynthia had my case filed and ready for trial in 6 months. My ...
Posted by Jan | January 27, 2012 | Workers Compensation
Very Good Experience
I attended the Workers Comp 101 workshop that Cynthia Hennessey spoke at. I learned so much, and I knew then that I wanted her to handle my case as I was in over my head. I had no idea how the insurance companies play hardball with work injuries. Cynthia was extremely nice to work with. As a nurse...
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2019
Client Champion Award, Martindale-Hubbell
1997 - Present
Attorney, Hennessy Law firm, LLC
1990 - 1997
Attorney, Evans & Dixon, LLC
Member
Member
Member
Permanent Total Disability Award Secured – Lifetime Benefits Granted (ALJ Reversed)
1991
JD - Juris Doctor
1985
BA - Bachelor of Arts
N/A
Missouri and Illinois Workers' Compensation
2026
2025
2025
2025
English